What's wrong with me?

A few days ago I was down at the beach and got a really bad sunburn, now it's starting to go away. Today, I've been feeling really shaky and kind of dizzy, and my nose has been stuffy (nose happened before the beach). I'm 5'4, 130 pounds, and athletic. I've been eating normally today, and I don't know whats happening. Is this just a fluke, and is my sunburn related to it?